ceph: properly release page upon error

When ceph_update_writeable_page fails (including -EAGAIN), it
unlocks (w/ unlock_page) the page but does not 'release'
(w/ page_cache_release) properly.

Upon error, properly set *pagep to NULL, indicating an error.

Signed-off-by: Taesoo Kim <tsgatesv@gmail.com>
Signed-off-by: Yan, Zheng <zyan@redhat.com>

diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
index fd5599d..e723482 100644 (file)
--- a/fs/ceph/addr.c
+++ b/fs/ceph/addr.c
@@ -1146,6 +1146,10 @@ static int ceph_write_begin(struct file *file, struct address_space *mapping,
                     inode, page, (int)pos, (int)len);
 
                r = ceph_update_writeable_page(file, pos, len, page);
+               if (r < 0)
+                       page_cache_release(page);
+               else
+                       *pagep = page;
        } while (r == -EAGAIN);
 
        return r;